Add log messages to the certificate callback path.

Logs are meant to test 2 theories regarding the
SIGSEGV in the attached bug:

 1. Failure is happening somewhere in the middle
    of the call path from tls_openssl to AIDL.
 2. sm struct becomes stale before the callback is
    used.

Bug: 275293332
Test: Connect to WPA-Enterprise network and verify logs.
Change-Id: I7b654d2a63f7f453f05b586f84c42702ac899d1e
6 files changed